What rhetorical techniques were used to celebrate the Beijing Olympics and welcome guests and friends from all over the world?

Duality. Celebrating the Beijing Olympics and welcoming friends from all over the world comes from the Beijing Winter Olympics. It expresses the welcome to foreign friends and uses the rhetorical technique of antithesis. The Olympic Games are under the guidance of Olympism, with sports and the quadrennial Olympic celebration-the Olympic Games as the main activities, promoting the all-round development of human physiology, psychology and social morality, communicating mutual understanding between people of all countries, and promoting mutual understanding among people in the world. An international social movement that popularizes Olympism around the world and safeguards world peace.